Multiplayer Piano is an online, full 88-key piano you can
play alone or with others in real-time. Plug up your MIDI
keyboard, MIDI in and out are supported. You should be able
to hear some seriously talented piano players performing
here! Join in or just chat and listen.
For good performance, Chrome is highly recommended. Firefox
also supports the requisite Web Audio API, but performance
may not be as good. Chrome has Web MIDI.
Of course, first you need to
Enable Javascript
or it won't do anything...!